Code style comments

[msachi]

• Please use a linter or manually indent your code. It's hard to read in places and it will cause you bugs in the future
• For example here you have some broken / unfinished code which would be easier to spot with clear indentation:

const compare = (err, hashedPassUserInput, hashedPassInDB, cb) => {
  if( err )
   cb( err )

   else {
     if( hashedPassUserInput == hashedPassInDB )
   }
}

• There's code duplication in database and database_test folders, I think it would be better to only have separate sql files and reuse the rest
• Work on variable naming, i.e. consistently snake-cased (checkCookie, instead of checkcookie - this is another source of many bugs), and also avoid trivial variable names like var functions = ... :)